Choose from the following the novel written by Vikram Seth.

A Suitable Boy

The correct answer is Option (1) - A Suitable Boy

Vikram Seth is known for his novels, and A Suitable Boy is one of his most famous works. The other novels you mentioned  (Half Girlfriend by Chetan Bhagat, One Indian Girl by Chetan Bhagat, and One Night at the Call Centre by Vikram Chandra) are not written by Vikram Seth.